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Exchange and ISP email accounts

I am installing Exchange 2003 on my server.  At the moment, all of my users have email from their ISP (@ISP.com).  The domain name for their network (domain.com) is different than their ISP email address .  I know how to set up Exchange to receive their ISP email (@ISP.com) and deliver it to their Exchange email account (@domain.com).  My question is can I set up Exchange to send their email from their Exchange accoount (@domain.com) to their ISP account (@ISP.com), so that recipients outside of the network will see @ISP.com as the address rather than @domain.com?  
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Bosaloski
Asked:
Bosaloski
1 Solution
 
susanzeiglerCommented:
Basically, you will want to set it up an additional Recipient Policy for the SMTP domain of isp.com and then make sure you un-check the box that says "Exchange is responsible for all mail for this domain". If the user exists locally, exchange should look to see if they do and will deliver the message. If the user does not, then the email will get sent along to the host DNS says. Then, set this as the primary address.

Here's an MS Technet article that goes through the steps you need--http://support.microsoft.com/kb/321721
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BosaloskiAuthor Commented:
I have learned that when you install Exchange it will ask you if Exchange will do all of the mail processing or if Exchange will connect to an ISP.  Then you can tell it the POP server.  Later in the installation Exchange will let you cange the email suffix if you want a different one than the Active Directory domain name.  Thanks for your answer.
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